REPORT on THE CIHIUPEDIA. 1 2'S 



scutal margin is slightly convex in the middle. The carina] margin is the longest of the 

 three ; it is hollowed out in the upper, and convex in the lower portion. 



The carina is simply bowed, large, and furnished with a flat roof. Ii onhj slightl] 

 increases in width from the upper to the lower end,and has well-developed sides at right 

 angles to the roof. The breadth of these sides increasesfrom the underto the upper extremity. 



The upper latus is trapeziform, or by the shortness of the carina] margin nearly 

 triangular. Its umbo is at its apex, which is produced and slightly protuberanl over the 

 scutum. The scuta] margin is hollowed out, the tergal margin is convex, the basal margin 

 is straight, the very short carinal margin is straight also. 



The rostral latus is small, being only very low, especially at the rostral extremity, 

 \\ here the slightly protuberant umbo is situated. The height of the valve slightly increases 

 towards the infra-median latus. A ridge, running from the umbo to the angle between 

 the lateral and basal margins, divides the valve into two parts. 



The infra-median latus is extremely small, triangular: it has the umbo at the apex, 

 which is directed forward. 



The carinal latus is rather large. The umbo is protuberant beyond the carina, and 

 situated at a considerable distance from the apex; hence the carinal margin is divided into 

 two parts, the larger above the umbo and a shorter part beneath it. The larger part, 

 which is above the umbo, almost equals in length the upper margin of the valve, the lateral 

 margin has about the same length as the smaller portion of the carinal margin. The 

 basal margin is as long as the basal margin of the rostral latus. 



Length of the capitulum, 10 mm. 



The peduncle is cylindrical, rather robust, not quite 3 mm. long, and covered by hairy 

 and thick membrane. The surface is beset with very protuberant scales, of which about 

 seven form a longitudinal row, seven of these rows forming the covering of the peduncle. 



Two specimens of this species were found in the Faroe Channel, al Station 10, cruise of 

 H.M.S. "Triton," August 24, 188-!; lat. 59° 40', long. 7 21' W.; depth, 516 fathoms; 

 bottom temperature, 8°C; bottom, mud. 



Observations. — This species is probably nearly related to Scalpellum cornutum, G. 0. 

 Sars. With regard to the structure of the complemental males, 1 can only say that in 

 one of the specimens a male has been found attached to the interior side of each of the two 

 scuta. However, the microscopic study of their organisation has given no results, 

 because their preservation was rather bad. 1 have only been able to ascertain that thej 

 ao-ree with the males of Scalpellum intermedium in the presence of two pairs of rudi- 

 mentary valves. These valves, probably, represent the scutum and the tergum, and in the 

 present species are not exactly of the same size : the shape of each is oval, but a larger 

 and a smaller one are placed close to one another, and the two arc separated by a some- 

 what greater distance from aquite similar couple of valves (PI. X. tig. 10). This condition 

 of the complemental male forms the transition from the structure of these males in 



